Have had them on the car for a few weeks now, 19's, and love them. Have found them to be a bit more sensitive to road conditions, notice a crappy road more than before ( which were stock 18's, so that seems obvious). Haven't noticed anything crazy or anything, can still drive on the highway at 80 good road with very little vibration but a bit is to be expected, and have pushed over 150 mph a few times and feels great... Not sure what you're experiencing

If it is always present at a certain speed, it is likely a balance issue. Could be an out of round tire, could be an incorrect balance, or the tire could have shifted on the wheel after the balance was done, or (may the wheel gods forbid) a wheel could be bent.

If it vibrates for a while at the start of the drive, and then smooths out, it may be temporary flatspotting.

Or it could be something I'm not thinking of, but those are the most likely suspects.

__________________

_______________________________________________

To credit the forum, click through one of the banners in my signature and the top of the page, or call me direct at 877.522.8473 ext 660. Email:ben@tirerack.com

If it is always present at a certain speed, it is likely a balance issue. Could be an out of round tire, could be an incorrect balance, or the tire could have shifted on the wheel after the balance was done, or (may the wheel gods forbid) a wheel could be bent.

If it vibrates for a while at the start of the drive, and then smooths out, it may be temporary flatspotting.

Or it could be something I'm not thinking of, but those are the most likely suspects.

Ben please explain out of round! I have a case with tire rack Yokohama agreed to take the tires back at 50% value. When i first had these tires installed in May 2010 they were amazing in all aspects. Then in July when the rear tires were 7/32 i thought i had some rear diff noise on decel and it became worse. After some dealer visits it was the tires causing the noise. Then at the beginning of August the fronts started makinfg some vibration at speed of 100 Mph plus and then got worse lots of vibration at 20 Mph like a thump, thump, thump. I talked to a German tire dealer he said the tires weren't designed for high speed use they can become out of round when heating up and cooling down? is this true? I know for sure these tires would never ever expierence these conditions in The U.S. I never had this problem with michelin PS2 or PS2 cups and I drove both those tires to 1.5mm. I currently have the rims and tires off the car need to get them dismounted to ship back to tire rack for my refund.

Any explanations would be great ben both tires are sitting at 6/32 with lots of life left what gives ive never ever expierenced these conditions before and i have been driving here in Germany for the past 15 years

Ben please explain out of round! I have a case with tire rack Yokohama agreed to take the tires back at 50% value. When i first had these tires installed in May 2010 they were amazing in all aspects. Then in July when the rear tires were 7/32 i thought i had some rear diff noise on decel and it became worse. After some dealer visits it was the tires causing the noise. Then at the beginning of August the fronts started makinfg some vibration at speed of 100 Mph plus and then got worse lots of vibration at 20 Mph like a thump, thump, thump. I talked to a German tire dealer he said the tires weren't designed for high speed use they can become out of round when heating up and cooling down? is this true? I know for sure these tires would never ever expierence these conditions in The U.S. I never had this problem with michelin PS2 or PS2 cups and I drove both those tires to 1.5mm. I currently have the rims and tires off the car need to get them dismounted to ship back to tire rack for my refund.

Any explanations would be great ben both tires are sitting at 6/32 with lots of life left what gives ive never ever expierenced these conditions before and i have been driving here in Germany for the past 15 years

Ah, OK. I was not aware that you had them for that long. When I said out of round, I was talking about the type of case where a tire is not built quite right, and does not balance properly. This would be discovered immediately.

The Yokos are designed for high speed use, they are generally rated for 168mph (W) or 186mph (Y). The AD08's were originally built for the Japanese market, and have generally held up very well to hard driving, drifting, and light track duty.

Heating up and cooling down may be a reference to the temporary flatspotting I mentioned. You run a tire, it gets hot, then you park it, and it cools down. In whatever position it stops, the bottom of the tire gets "smushed" and flattens out a little, and once it cools it wants to stay in that shape.

Then when you start out the next day, it can thump/vibrate/shimmy etc. If this were the cause, a few miles of driving would smooth them out, unless you left the car parked in one place for months or years.

From your description, it sounds like the tires have developed some type of uneven wear or defect or damage. I am glad that customer service was able to help you. If you can PM me your invoice number, I can try to find out what the diagnosis is when they get back.

__________________

_______________________________________________

To credit the forum, click through one of the banners in my signature and the top of the page, or call me direct at 877.522.8473 ext 660. Email:ben@tirerack.com